Technology	Maturity	Readiness	Evidence	Momentum	Adoption barriers	Rated
2D semiconductor electronics	Lab demonstration	2	4	4	Making large, uniform sheets of 2D semiconductor reliably; Contact resistance between metals and 2D channels; Lack of agreed benchmarks for comparing devices; Competition from mature silicon manufacturing	2026-10-21
3D-printed buildings	Pilot and early commercial	4	3	4	No finished national building standard for printed concrete walls yet; Weak interlayer bonds and limited long-term durability data; Unclear cost advantage once printers, materials and logistics are included; Trades and local authorities need to adapt to partly printed builds	2026-10-21
4D printing	Research and prototypes	2	3	4	Slow recovery at low temperatures; Limited evidence on repeated use and long-term durability; Preclinical testing only for medical devices; Limited evidence on build size, throughput and cost	2026-10-22
Accelerated transcranial magnetic stimulation	Commercial	4	3	3	Individual targeting needs a brain scan and processing before treatment; Limited trial data on durability beyond about one month; Few large sham-controlled trials compare accelerated with standard protocols; Cost and clinic capacity, with no verified figures in the sources reviewed	2026-10-21
Acoustic levitation	Lab demonstration	2	4	3	Small payload mass and limited working volume; Stability limits under acceleration and at the edges of the workspace; Size, cost and complexity of phased arrays and control electronics; Ultrasound exposure, noise and safety in shared spaces	2026-10-21
Adaptive deep brain stimulation	Commercial	4	3	4	Need for a suitable brain signal in each person, which may require specialist sensing and algorithm tuning; Clinic time for setup and programming, although the Electrode Identifier is claimed to shorten it; Surgical and hardware risks of implanted electrodes; Limited independent evidence beyond small or manufacturer-funded trials	2026-10-21
Aerogels	Commercial	5	4	3	Brittleness of pure silica aerogel; Production cost and drying equipment; Competition from cheaper conventional insulation	2026-10-20
Agricultural spray drones	Pilot and early commercial	3	3	3	Spray drift and uneven deposition compared with ground sprayers; Permit rules in the UK, with no commercial pesticide route at present; Limited independent field evidence on pesticide savings; Certification and operator training requirements that differ by country	2026-10-21
AI coding agents	Commercial	4	2	4	Contested evidence on whether they speed up experienced developers; Benchmark validity concerns, including possible memorisation; Security risks and the review effort needed for agent-written code; Reliance on developers' willingness to work with AI tools	2026-10-21
AI mathematical reasoning and theorem proving	Research and prototypes	2	4	5	Results so far are limited to olympiad-level problems; Formal proof requires translating problems into Lean, which takes skilled effort; Headline results are mostly announced by the companies that built the systems; Compute cost and run time for hard problems	2026-10-21
AI protein structure prediction	Research and prototypes	4	4	4	Accuracy for flexible proteins, complexes and proteins with few known relatives is less well established; Accuracy claims from developers need independent checks; Experimental validation is still needed before use in high-stakes decisions	2026-10-21
AI tutors	Pilot and early commercial	3	3	4	Evidence that answer-giving tools can reduce independent performance; Mixed results across trials and few long-term studies; Fit with local languages and curricula; Teacher training and time to redesign lessons	2026-10-22
AI weather forecasting	Pilot and early commercial	4	3	5	Limited independent testing of headline claims outside the developers' own evaluations; Weaker small-scale detail and physical consistency than physics-based models, according to critics; Forecast trust for rare and extreme events, which may be poorly represented in training data; Dependence on reanalysis datasets and the computing infrastructure needed to produce them; Operational integration and forecaster confidence while physics-based systems remain in use	2026-10-21
AI-assisted chip design	Pilot and early commercial	3	2	4	Disputed evidence for the central performance claims of the Nature method; Vendor-reported results that cannot be compared directly and have not been independently verified; Reproducibility problems, including data and code availability and compute requirements	2026-10-22
Analogue quantum simulation	Research and prototypes	3	3	4	Independent verification of results, which requires classical or other checks that are hard to scale; Noise and limited control as arrays grow; Each device realises only the models it was built for; Few groups have the equipment and specialist skills to run these experiments	2026-10-21
Artificial muscles (soft actuators)	Research and prototypes	2	4	3	High-voltage or pump-based power systems that are hard to miniaturise; Low overall energy efficiency for some actuator types; Uncertain long-term durability outside the lab; Safety engineering for use close to people	2026-10-22
Artificial photosynthesis	Research and prototypes	2	3	4	Efficiency falls at larger area in the reported studies; Durability beyond laboratory tests has not been shown; Lead-containing absorbers raise containment and recycling questions; Competition from photovoltaic power coupled to electrolysers	2026-10-21
Assembly-line mass production	Commercial	5	3	2	Lines need large, stable volumes of one product to pay back the cost of fixed stations and tooling; Changing a line for a new model is costly and slow; Gains in one industry do not transfer automatically to others with different product designs	2026-10-22
Asteroid mining	Research and prototypes	1	3	3	No asteroid extraction, processing or delivery has been demonstrated; Transport, mission and spacecraft reuse costs; Unsettled domestic and international rules on space resources; Debris, safety and mission-interference planning	2026-10-21
Asteroid sample return missions	Pilot and early commercial	5	4	3	Mission cost and long development times; Small sample sizes that limit destructive analysis; Few sample return missions have flown so far	2026-10-21
Atmospheric water generators	Pilot and early commercial	3	3	3	High energy use per litre in dry or cold air; Limited independent test data for named products; Cost per litre not publicly stated in the sources checked	2026-10-22
Atmospheric water harvesting (MOF/sorbent based)	Research and prototypes	2	4	4	Low water output per kilogram of sorbent and per device; Cost and large-scale manufacture of MOF sorbents; Heat and energy needed to release water; Performance varies with local climate	2026-10-20
Autonomous laboratories	Research and prototypes	2	4	4	Custom equipment and software integration; Setup, calibration and maintenance effort; Limited transfer between chemistry and instrument configurations; Need for domain experts and trained technical staff; Data quality, reproducibility and validation; Costs and unequal access to specialised facilities	2026-10-21
Autonomous road vehicles	Pilot and early commercial	4	3	4	Limited independent crash data across operators and cities; Changing federal crash-reporting rules; Public trust and the need for clear performance benchmarks	2026-10-21
Autonomous surgical robots	Lab demonstration	2	3	4	No human clinical evidence in the sources reviewed; Regulatory pathway for higher levels of autonomy is unclear; Liability and responsibility when a robot makes a decision; Robustness to unexpected tissue movement and anatomy	2026-10-21
Autonomous underwater vehicles	Commercial	4	4	3	Ship time and cost for deployment and recovery; Navigation and communication limits without GPS or surface contact; Battery life and the funding needed to replace floats; Sea ice that blocks access to Antarctic ice shelves	2026-10-21
Base and prime gene editing	Research and prototypes	3	4	5	Delivery to target tissues; Off-target and bystander edits; Cost and time to make individual therapies; Limited long-term safety data	2026-10-21
Battery-free wireless implant sensors	Research and prototypes	2	3	3	No in vivo testing in living animals or patients yet; Signal strength falls with implant depth; Long-term durability of the magnesium sensing element is unproven; Regulatory evidence needed before any clinical use	2026-10-21
Biochar	Commercial	4	3	3	Yield gains are uneven and absent in many temperate settings; Long-term permanence depends on models built from a small number of studies; Feedstock sourcing and sustainability questions; Inconsistent public reporting of credit volumes and deliveries	2026-10-21
Bionic limbs with nerve and bone connection	Pilot and early commercial	3	3	4	Two-stage surgery and long-term infection risk at the skin-implant interface; Small trial sizes and limited long-term outcome data; Limited sensory feedback and battery life in current nerve-controlled prostheses; Cost and access to specialist surgical and rehabilitation services	2026-10-21
Bioresorbable (transient) electronics	Research and prototypes	2	4	3	No completed human clinical trials of fully implanted devices; Short and variable functional lifetimes; Regulatory evidence needed on degradation products; Dependence on external wireless power or control hardware	2026-10-20
Brain organoids	Lab demonstration	2	4	4	Variability between organoids and between cell lines; Lack of blood supply, which limits size; No demonstrated learning or computing function; Unresolved ethics of consciousness, consent and animal transplantation	2026-10-21
Brain-computer interfaces	Pilot and early commercial	3	3	4	Surgical risk and long-term safety in larger groups; Small trial sizes and reliance on a few research sites; Regulatory approval and payment pathways; Device cost and the clinical support it needs	2026-10-21
Breath diagnostics	Research and prototypes	2	2	3	Few large, independent validation studies, and some results come from the device makers or companies with links to the devices; Low specificity in some studies, which would lead to many unnecessary follow-up tests; Lack of standard sampling methods and reproducible VOC markers across devices; Regulatory route and financial case for routine use are still unclear	2026-10-21
Car electronics and engine control	Commercial	5	3	4	Cybersecurity risks from connected, updatable vehicle software; Cost and complexity of moving from many ECUs to central or zonal computers; No single agreed definition or standard for software-defined vehicles in the sources reviewed	2026-10-22
Carbon-storing building materials	Pilot and early commercial	3	2	3	Production of biochar to repeatable specifications; Building codes, standards and procurement rules built around established materials; Long-term durability and carbon retention evidence, including end of life	2026-10-21
Catalytic converters	Commercial	5	3	2	Dependence on platinum-group metals; Dependence on lead-free petrol	2026-10-22
Chiplets and advanced chip packaging	Commercial	4	3	4	Advanced packaging capacity is constrained; Heat removal from stacked dies; Yield and test cost for known good dies; Power and area cost of die-to-die links	2026-10-21
Closed-loop brain stimulation for epilepsy	Commercial	5	3	3	Requires brain surgery and an implanted device, with infection and explantation risks; Approved only for a narrow group of adults with focal seizures; Benefit varies widely between people, and many people still have seizures; Adaptive deep brain stimulation for epilepsy lacks peer-reviewed efficacy results	2026-10-21
Clutches, gearboxes and differentials	Commercial	5	3	2	Electric drivetrains need fewer gears, which reduces demand for conventional gearboxes.; Cost and complexity of multi-speed automatic transmissions.; Patent and production records from the early twentieth century are incomplete, so dates are hard to confirm.	2026-10-22
Cochlear implants	Commercial	5	4	3	Wide variation in outcomes between users; Surgery and the rehabilitation needed to learn to hear through an implant; Limited evidence for totally implantable and optical designs in people	2026-10-21
Commercial lunar landers	Pilot and early commercial	3	3	4	Landing failures and tip-overs in the four named attempts; Limited number of completed missions, with no long-term operating record; Payload capacity figures that are mostly projections; Dependence on government contracts for most demand	2026-10-22
Commercial space stations	Research and prototypes	2	3	4	Procurement not yet awarded, with proposals and awards planned for late 2026 and spring 2027; Repeated schedule slips, with Haven-1 moving from 2026 to no earlier than Q1 2027; No published funding figures for the second phase in the sources reviewed; Unresolved gap risk between ISS retirement and first commercial operations, as GAO noted	2026-10-21
Computer-use AI agents	Pilot and early commercial	2	3	4	Low success rates on benchmarks compared with humans; Prompt injection from untrusted web content; Errors in locating and acting on interface elements; Difficulty of checking results when no independent evaluation is available	2026-10-21
Consumer brain-sensing wearables	Pilot and early commercial	3	2	4	Thin independent validation outside healthy adults and single lab nights; Signal quality of dry electrodes over many nights of home use; Unclear or uneven rules on the collection, sharing and use of neural data; Subscription and hardware costs for consumers	2026-10-21
Crops with boosted photosynthesis	Research and prototypes	2	2	4	Yield results in soybean are disputed and not yet independently replicated; Gains depend on conditions such as fluctuating light and nitrogen supply; Transgenic crops face lengthy regulatory and public acceptance processes	2026-10-22
Cultivated meat	Research and prototypes	2	2	3	Culture medium and bioprocess cost; Scaffolding and structure for thick tissue; Regulatory approval product by product; Consumer acceptance, which varies widely by country	2026-10-21
Delivery drones	Pilot and early commercial	4	2	4	Approvals granted per operator and per area, with draft and trial stages still common; Crashes and software faults that lead to pauses; Local objections to hubs over noise and planning; Limited independent safety and noise data	2026-10-21
Digital twins of the Earth	Pilot and early commercial	3	2	4	High computing cost per simulation; Limited published validation of km-scale outputs against observations; Dependence on access to public supercomputers; Unbenchmarked performance claims for AI emulators	2026-10-21
Direct air capture of CO2	Pilot and early commercial	3	3	4	Cost per tonne of CO2 removed; Energy demand for capture and regeneration; Access to secure storage and permitting; Stability of public funding and carbon policy	2026-10-21
Direct-to-phone satellite messaging	Pilot and early commercial	4	3	4	Phone chipset and device support, especially for 3GPP Release 17 NTN; Spectrum access rules and interference limits for satellite use of mobile bands; Limited data capacity per satellite beam; Consumer pricing and plan structures	2026-10-21
Distributed fibre-optic sensing	Pilot and early commercial	4	4	3	Cost of interrogation equipment and processing; Phase noise and polarisation fading in long fibres; Access to telecom dark fibre and agreements with cable owners	2026-10-21
DNA data storage	Research and prototypes	2	4	3	Very high cost per byte written; Slow write and read speeds; Limited end-to-end automation; Lack of established standards and integration with existing storage systems	2026-10-20
DNA nanotechnology and DNA origami	Research and prototypes	2	4	3	Limited evidence from living animals or patients; Cost and scale of synthesising many short strands; Stability of DNA structures in biological fluids	2026-10-21
Drought-tolerant crops	Pilot and early commercial	4	3	3	Gap between managed-drought trial results and farm yields; Trade approvals needed before genetically modified crops can be sold; Seed system access and cost for smallholder farmers; Limited independent published data on the HB4 traits	2026-10-22
Electric aircraft	Pilot and early commercial	3	4	4	Battery mass and pack-level energy density; Certification of novel electric propulsion and high-voltage systems; Airport charging capacity and grid connection; Route economics against conventional turboprops and jets; Maintenance of two propulsion architectures in hybrid aircraft	2026-10-21
Electric space propulsion	Commercial	5	4	4	Low thrust means long transit times; Large solar arrays are needed for electrical power; Xenon cost and supply are limited; Krypton gives lower thrust efficiency than xenon	2026-10-22
Electric vertical take-off and landing aircraft	Pilot and early commercial	3	2	4	No confirmed type certificate in the sources reviewed; Battery energy density and power for vertical flight; Public acceptance and urban airspace integration, not covered by the sources reviewed	2026-10-21
Electrochemical CO2 conversion	Research and prototypes	2	3	3	Electricity cost and carbon intensity; Long-term stability, water balance and salt management at large area; Access to low-cost purified CO2; Limited product markets and competition from existing production	2026-10-21
Electrolysers for low-carbon hydrogen	Pilot and early commercial	4	4	4	High system and electrocatalyst costs; Unclear government support and policy certainty; Supply chain pressure and the need for low-carbon electricity	2026-10-21
Electronic skin	Research and prototypes	2	4	4	Durability of soft circuits under repeated stretching and sweat; Power supply and wireless data transfer for soft devices; Low integration density compared with silicon; Regulatory and clinical evidence needed for medical and prosthetic use	2026-10-20
Engineered living materials	Research and prototypes	2	3	3	Tensile strength, tear strength and water resistance still need improvement, by the authors' own account; Scale-up from litre-scale cultures to consistent production of larger films; Feedstock choice, energy use and life-cycle impact are not yet established; Independently verified disposal routes and packaging-specific safety and barrier tests are not yet available	2026-10-21
Engineered living therapeutics	Research and prototypes	2	2	3	Proving benefit in patients with chronic disease; Containing and clearing live organisms; Genetic stability of engineered circuits; Manufacturing and regulation of live products	2026-10-21
Enhanced geothermal systems	Research and prototypes	3	3	3	Long-term reservoir performance not yet demonstrated; Drilling and well costs, and well failure or repair rates; Induced seismicity risk and permitting; Water supply, losses and fluid chemistry; Pumping energy and surface plant costs	2026-10-21
Enhanced rock weathering	Pilot and early commercial	3	2	4	Removal is hard to measure directly and is mostly calculated; Cost of mining, grinding and transporting rock per tonne of CO2; Uncertainty about trace metal and dust effects at scale; Few replicated, long field trials	2026-10-21
Environmental DNA monitoring	Pilot and early commercial	4	3	3	Survey protocols are specific to each species and are still under regulatory review for great crested newts; Single positive and negative results carry measurable error rates; Abundance cannot yet be read reliably from eDNA concentration; Air sampling needs more labour and is less spatially precise than soil or water sampling	2026-10-21
Event-based (neuromorphic) cameras	Commercial	4	4	4	Most existing vision software and training data assume frame-based images; Limited standard tools and benchmarks for event data; Uncertain fit against cheaper, mature frame cameras for general use	2026-10-21
Extreme ultraviolet (EUV) lithography	Commercial	5	4	4	Cost of High-NA scanners, reported at about 350 million euros each; A single supplier for EUV scanners; Source power and conversion efficiency of tin plasma; Smaller High-NA exposure field, which adds exposures per wafer	2026-10-21
Flow batteries	Pilot and early commercial	4	3	4	High upfront capital cost compared with lithium-ion for short-duration storage; Lower energy density than lithium-ion; Limited public data on long-term stack durability and full-system efficiency	2026-10-21
Focused ultrasound for the brain	Research and prototypes	3	3	4	Inconsistent effects across stimulation settings and targets; Incomplete understanding of how the effects arise; No approved low-intensity indication in the sources reviewed; Equipment and targeting setup needed for each stimulation protocol	2026-10-21
Fusion energy	Research and prototypes	2	3	4	No net electricity from a fusion plant is shown in the sources reviewed; The ITER schedule has moved, with deuterium-tritium operations now planned for 2039; Plant cost and engineering scale are not verified in the sources reviewed	2026-10-21
Gene drive mosquitoes	Research and prototypes	2	3	3	No gene drive release into the wild has yet been tested in the field; Regulatory and community acceptance, as shown by the 2025 Burkina Faso suspension; Uncertainty about off-target ecological effects and drive resistance	2026-10-21
Gene therapy for inherited deafness	Pilot and early commercial	4	3	4	Eligibility restricted to biallelic OTOF variants; Small numbers of treated children and short follow-up; Surgical delivery into the cochlea and procedure-related risk; Unclear long-term cost and access beyond the free offer in the United States	2026-10-21
Gene-edited crops	Pilot and early commercial	3	4	4	Different regulatory rules between countries; Consumer acceptance and labelling; Cost and time of developing and field-testing new traits	2026-10-21
Gene-edited livestock	Pilot and early commercial	3	4	4	Export-market approvals are needed before a US launch of the PRRS-resistant pig; Public acceptance of gene-edited meat is uncertain, and a 2022 UK survey expects societal opposition; Unplanned edits such as plasmid insertions need careful screening; Animal-specific rules in some markets are incomplete	2026-10-21
Gene-edited pig organ xenotransplantation	Research and prototypes	3	2	5	Immune rejection and the drugs needed to control it; Limited number of living cases and peer-reviewed outcome data; Animal welfare, biosecurity and the cost of pig facilities; Regulatory approval for clinical trials and long-term follow-up	2026-10-21
High-density neural probes	Research and prototypes	3	4	4	Human use so far is limited to acute recordings during surgery; Variable recording yield and probe fracture during insertion; Limited tissue safety data from people; Linking recorded neurons to cell type in humans is unresolved	2026-10-21
Hollow-core optical fibre	Pilot and early commercial	3	3	4	Drawing long lengths of hollow-core fibre is harder than drawing solid fibre; Connectors, splicers and amplifiers must be built for the new fibre; Latency and deployment evidence comes mainly from the company deploying it; Production cost compared with mature solid-glass fibre, which the sources reviewed did not quantify	2026-10-21
Humanoid robots	Research and prototypes	2	3	4	Few tasks beyond walking and handling have been shown; Battery runtime, dexterity and safety around people are not verified in the sources reviewed; Unit cost and deployment scale are not verified in the sources reviewed	2026-10-21
Hydrogen aircraft	Research and prototypes	2	3	4	Cryogenic tank volume, mass and shape in aircraft design; Certification basis for hydrogen fuel systems and fuel cells; Airport hydrogen supply, storage and refuelling; Low-carbon hydrogen supply and lifecycle emissions	2026-10-21
Hyperspectral imaging	Pilot and early commercial	4	3	4	Large data volumes and the cost of processing them; Calibration effort across dates, times and sensors; Few validated field and clinical datasets; Medical acquisition devices are still large prototypes	2026-10-21
In vivo gene editing	Research and prototypes	3	3	4	Long-term safety and durability are not yet established; Delivery is limited to liver-directed approaches in human studies; Patient-specific manufacturing and regulatory pathways are unresolved; Cost and access for one-time treatments	2026-10-21
In-space manufacturing	Research and prototypes	3	2	4	Metal and non-polymer processes are still in development; Key results are mostly reported by the organisations running the experiments; Return-to-Earth logistics and cost; Limited independent data on cost and throughput	2026-10-21
In-space servicing and assembly	Research and prototypes	3	4	4	Satellites are rarely designed with standard service interfaces; Close-proximity operations carry collision and debris risk; Cost comparison with building and launching replacement hardware is not yet established	2026-10-21
Industrial steelmaking	Commercial	5	4	3	Cost premium of early hydrogen-based plants, estimated by the IEA at 50% to 140% above BF-BOF plants; Slow build-out of near-zero emissions capacity, about 10 Mt of iron by 2030 according to the IEA; Large existing fleet of blast furnace and basic oxygen plants, which make about 70% of global steel	2026-10-22
Insect protein farming	Pilot and early commercial	4	3	2	Capital-intensive plants that have struggled to reach profitability, as Ynsect's liquidation shows; Novel food approvals for human food and allergy labelling requirements; Feed rules that limit feedstocks and exclude ruminants; Price competition with established feed proteins (qualitative only; cost figures not verified)	2026-10-21
Iron-air batteries	Research and prototypes	2	3	3	No public round-trip efficiency figure for the tested modules; Only kilowatt-scale prototype modules have been tested, and no grid-connected multi-day plant has been shown to operate; Long-duration storage value depends on market design, which may not reward rare, long events	2026-10-21
Jet suits and jetpacks	Pilot and early commercial	2	2	3	Short flight times and limited fuel capacity; High cost per suit and pilot training; Noise near people and in towns; No settled UK regulatory category found in the sources reviewed	2026-10-21
Lab-grown red blood cells	Research and prototypes	2	2	3	Low yield per stem cell and incomplete enucleation; Manufacturing cost per unit and high media cost; Scale-up in closed bioreactors with fully defined, clinical-grade reagents; Survival of lab-grown cells in people, which is not yet reported	2026-10-21
Laser and robotic weeding	Pilot and early commercial	4	3	4	Machine cost: the trial authors estimate at least $500,000 per unit; Slow laser operation in dense weed stands; Savings depend on weed pressure and season, which makes returns hard to predict	2026-10-21
Laser communication links	Pilot and early commercial	4	4	4	Cloud and weather outages need several ground stations spread across sites; Very precise pointing and acquisition between moving platforms; Vendor interoperability, which depends on shared standards; Ground network cost, for which the sources reviewed give no verified figures	2026-10-21
Laser-written glass data storage	Research and prototypes	2	3	3	Write and read speeds and density are not yet at the level needed for large archives; Lifetime claims rest on accelerated tests and extrapolation rather than long-term observation; Dedicated femtosecond laser writers and polarisation or phase readers are specialist equipment; No commercial product or release date has been announced	2026-10-21
Lead-acid batteries	Commercial	5	4	2	Low energy density compared with lithium-ion cells; Lead content and the need for careful recycling; Limited cycle life under deep discharge	2026-10-22
Legged robots	Commercial	4	3	4	Battery runtime of about 90 minutes for a commercial quadruped; Payload limit of about 14 kg for Spot; Most industrial results are vendor-reported, so buyers have limited independent evidence; Certification needed for hazardous areas; according to ANYbotics, an Ex-certified ANYmal C version is in co-development	2026-10-22
Li-Fi (light-based wireless networking)	Pilot and early commercial	3	3	3	Line of sight and wall blocking limit coverage to one room; Limited transmit power on small devices constrains the uplink; Installation cost and specialised hardware; The sources reviewed give no independent deployment or market figures	2026-10-22
Lithium-ion batteries	Commercial	5	4	3	Fire risk from thermal runaway; Dependence on nickel-containing chemistries and their supply chains outside China; Immature recycling routes for spent cells	2026-10-22
Low-boom supersonic aircraft	Research and prototypes	2	3	4	Sonic boom and airport noise rules that are still proposed or not yet written; Full-engine testing and certification of new supersonic engines; Fuel burn, cost per seat and small passenger capacity; Non-CO2 climate effects and the supply of sustainable fuel	2026-10-21
Lunar resource extraction	Lab demonstration	2	3	3	No lunar extraction has been demonstrated on the Moon; Surface drilling and landing reliability, shown by the PRIME-1 outcome; Power, storage and processing equipment that must work together in lunar conditions; Uncertain ice concentration and distribution at candidate sites; Cost and schedule risk, shown by the VIPER cancellation	2026-10-21
Magnetic levitation	Research and prototypes	3	3	3	Dependence on a prepared track or guideway; Cooling requirements for superconducting designs; Cost of infrastructure and maintenance; Limited independent verification of rider-carrying performance	2026-10-21
Making oxygen and fuel on Mars	Research and prototypes	2	3	3	Scaling from a small instrument to a plant of roughly 200 times the oxygen output; Durability of catalysts and electrochemical cells over long, cycling operation; Power supply and heat management on the Martian surface; Reliable access to water ice and water purification at the landing site	2026-10-22
Mechanical metamaterials	Lab demonstration	2	3	4	Manufacturing at useful sizes and volumes; Fabrication accuracy for fine geometric features; Limited durability and long-term performance data; Design tools needed to predict behaviour reliably	2026-10-21
Metal additive manufacturing	Commercial	4	4	4	Gas porosity and lack-of-fusion flaws that must be controlled and inspected; Lack of agreed qualification and certification routes outside NASA standards; Limited printability of many alloys; Cost and speed comparisons with conventional manufacturing not verified in the sources reviewed	2026-10-21
Metasurface optics and flat lenses	Research and prototypes	2	4	4	Lens size and aperture demonstrated so far are small; Efficiency and bandwidth trade-offs for achromatic designs; No verified production volumes or commercial performance figures in the sources reviewed	2026-10-21
MicroLED displays	Pilot and early commercial	3	4	2	Mass transfer yield and speed for millions of chips per screen; Efficiency loss in small pixels, especially from sidewall damage; Manufacturing cost compared with OLED and mini-LED backlit displays; Reported withdrawal or scaling back by some large makers and buyers (Apple, Samsung)	2026-10-21
Multi-cancer early detection blood tests	Pilot and early commercial	3	3	4	No demonstrated reduction in cancer deaths; Low sensitivity for early-stage and some cancer types; Burden of follow-up tests after false-positive results; Uncertain regulatory decision and NHS rollout criteria	2026-10-21
Mycelium composites	Research and prototypes	2	3	3	Batch-to-batch variation in biological growth; Moisture sensitivity and limited durability data; No building-material fire classification for most formulations; Lack of standardised tests and verified life-cycle comparisons	2026-10-21
Neuromorphic computing chips	Research and prototypes	3	4	3	Immature software ecosystem compared with GPUs; Accuracy gap for spiking networks on many tasks; Lack of independent, workload-level benchmarks; Strong incumbent advantage of GPU and AI accelerator vendors	2026-10-20
Neutral-atom quantum computers	Research and prototypes	2	4	5	No neutral-atom machine has yet run a large error-corrected calculation; Atom loss and reloading overhead at large scale; Competition from superconducting and trapped-ion platforms; Need for higher-power, stable trapping optics and control electronics	2026-10-21
Nitrogen-fixing cereals	Pilot and early commercial	3	3	4	Inconsistent yield and nitrogen-supply results across sites and seasons; Oxygen sensitivity and cluster assembly problems for engineered nitrogenase in plants; Uncertain benefit when fertiliser is cut, which gives farmers little reason to switch; Biosafety and regulatory oversight of gene-edited microbes and crops	2026-10-21
Nuclear space propulsion and power	Research and prototypes	3	4	4	Launch safety reviews and regulatory approval for reactors in space; Limited plutonium-238 supply for radioisotope generators; Cost and schedule risk in flight programmes, shown by the closure of DRACO; No flight data yet for reactor-based propulsion	2026-10-21
Ocean alkalinity enhancement	Pilot and early commercial	2	2	4	Net removal cannot yet be measured directly in open water; Ocean models are not robustly validated for credit calculations; Ecological effects of large-scale additions are untested; The London Protocol framework is not yet binding for OAE	2026-10-21
Ocean thermal energy conversion	Research and prototypes	2	3	3	Low net efficiency from the small temperature difference between surface and deep water; Long deep-water intake pipes, with fouling, corrosion and mechanical loads; Lack of long-duration offshore data and verified cost figures; Environmental baseline and monitoring requirements at intake and discharge sites; Competition from solar, wind, batteries and imported fuel	2026-10-21
Optical atomic clocks	Research and prototypes	3	4	4	Optical clocks are laboratory-scale systems that need specialist operation; Reproducibility and uncertainty budgets for transported clocks are still being established; The choice of species and the redefinition itself depend on international agreement	2026-10-21
Optical interconnects and co-packaged optics	Research and prototypes	3	3	5	Thermal management of packages that combine switch silicon and optics; Reliable, scalable light sources, including VCSEL arrays and integrated lasers; Fibre coupling and standardisation across vendors; Uncertain system-level power savings beyond lab demonstrations	2026-10-21
Optogenetics	Research and prototypes	2	3	4	Safe delivery of light-sensitive genes into human cells, and unknown long-term effects of expressing them; Need for implanted or wearable light-delivery devices; Very few patients studied, with no randomised human efficacy data; Regulatory pathway for combined gene therapy and device products	2026-10-21
Orbital data centres	Research and prototypes	2	2	4	Heat rejection needs large radiators, which compete with power and antenna systems for mass and geometry; Radiation damage to processors, memory and other components over multi-year missions; Launch and replacement costs per kilogram, and the cost of frequent hardware refresh; Limited high-bandwidth links between orbit and the ground; Lack of independently verified operating records	2026-10-21
Organ and tissue cryopreservation	Research and prototypes	2	3	3	Toxicity of high cryoprotectant concentrations; Devitrification and cracking in organs larger than the rat kidney; Even nanoparticle distribution through whole organs; Regulatory route as a combined drug and device; Limited independent replication	2026-10-21
Organ-on-a-chip	Pilot and early commercial	3	4	4	Formal regulatory qualification still in progress; Drug absorption into PDMS and other material effects; Donor-to-donor and lab-to-lab variability; Lower throughput and higher cost per data point than plate assays	2026-10-20
Passive daytime radiative cooling	Research and prototypes	3	4	4	Long-term outdoor durability and soiling; Reduced performance in humid and cloudy climates; Lack of standard test protocols	2026-10-20
Perennial grains	Pilot and early commercial	3	3	4	Yield decline as stands age, which limits the crop's useful life in a field; Lower and less certain yields than established annual grains; Limited seed supply and breeding that is still at an early stage; No proven soil carbon benefit, which weakens the case for paying farmers to grow them; Need for new processing and buyer relationships for new grain types	2026-10-21
Peripheral nerve interfaces	Research and prototypes	2	3	4	Tissue injury, axonal degeneration and scar formation around penetrating electrodes (Tian and colleagues, 2024); Small human studies with short follow-up, so long-term safety and benefit are not yet shown; Sensations that are hard to control precisely (Page and colleagues, 2021); No approved nerve interface device in the sources reviewed	2026-10-22
Perovskite-silicon tandem solar cells	Pilot and early commercial	3	4	5	Unproven 25-year outdoor durability; Scale-up of deposition and manufacturing throughput; Gap between laboratory cell and commercial module efficiencies; Bankability and certification for large projects	2026-10-20
Petroleum refining	Commercial	5	4	2	Large capital cost and long life of existing refinery plants; Emissions rules and the cost of compliance; Changing demand for fuels in some markets	2026-10-22
Photonic computing for AI	Research and prototypes	2	3	4	Analog precision and noise; Conversion between optical and electronic signals; Limited software tools and standard benchmarks; Manufacturing tolerance of photonic chips	2026-10-21
Photonic integrated circuits	Pilot and early commercial	4	3	4	Packaging, fibre-to-chip coupling and assembly cost; Limited foundry capacity and design tools for small users; Unverified field reliability of co-packaged optics; Small overall market compared with electronics, which limits investment in new foundry processes	2026-10-21
Photonic quantum computers	Research and prototypes	2	3	4	Photon loss in chips, fibre and detectors, which is the main barrier to fault tolerance; Limited qubit counts in demonstrated machines; Cost and scale of the cooling, detector and control hardware; Reliance on company-reported figures that are not yet independently replicated	2026-10-21
Planetary defence	Research and prototypes	3	4	4	A single kinetic impact test on one small binary moon does not show the method works on every target; Survey coverage of large near-Earth objects is incomplete; No operational deflection mission or funded response system is in place yet; Decisions to deflect an object would need international coordination	2026-10-22
Plant microbial fuel cells	Research and prototypes	2	2	3	Limited and variable power output; Soil variability between sites and seasons; Need for energy storage and power management; Little independent long-term field data	2026-10-21
Post-quantum cryptography	Commercial	4	4	4	Migration effort across large and specialised systems; Rarely used technologies that are hard to upgrade by 2035; Young algorithms that need continued scrutiny; Signature migration timetable not yet set out in the sources reviewed	2026-10-21
Precision fermentation	Pilot and early commercial	3	3	4	Cost and scale-up of fermentation for food-grade proteins; Regulatory clearance that differs by country; Consumer perception of 'synthetic' or 'lab-made' proteins; Limited independent evidence on commercial performance	2026-10-21
Precision livestock farming	Commercial	4	3	4	Validation on farms other than the test site, which is limited for welfare and health tools; Unresolved safety questions for Bovaer after the 2026 Danish reports; Unsettled ownership and sharing terms for farm data; Cost of sensors and software for smaller farms	2026-10-21
Precision machine tools and interchangeable parts	Commercial	5	4	3	Cost of precision machines and skilled operators; Measurement standards and gauges needed to check parts; Resistance from craft workshops used to hand fitting	2026-10-22
Protein made from air and electricity	Pilot and early commercial	3	3	4	Electricity cost and carbon intensity, which dominate the economics and climate results; Scale-up from design capacity to measured, sustained output; Regulatory review and consumer acceptance in each market; Capital cost of gas fermentation and electrolysis plants	2026-10-22
Quantum annealing	Pilot and early commercial	3	2	3	No clear, reproduced speed-up on practical optimisation problems; Classical heuristics and tensor-network methods keep improving; Gains are hard to separate from the classical steps in hybrid solvers	2026-10-21
Quantum error correction	Lab demonstration	2	4	5	Very large numbers of physical qubits for each logical qubit; Real-time decoding at larger scale; Fabrication yield and control electronics for large chips	2026-10-21
Quantum gravimetry	Research and prototypes	3	3	3	Survey time per site, because vibration must be averaged out; Accuracy and repeatability for repeated groundwater monitoring, which the sources reviewed do not establish; Size, power and operational complexity of cold-atom instruments; Cost compared with conventional gravimeters and geophysical methods; No blinded comparison on known underground targets in the sources reviewed	2026-10-21
Quantum key distribution	Pilot and early commercial	3	4	3	Low secure key rates over long distances; Specialised hardware and certification effort; Authentication still needs separate quantum-safe mechanisms; UK government guidance does not endorse use for government or military applications	2026-10-21
Quantum memories	Lab demonstration	2	4	4	No single memory yet combines long storage time with high efficiency and fidelity; Some demonstrations need cryogenic temperatures; Scaling to many memories that work together in a network is not yet shown	2026-10-22
Quantum random number generators	Commercial	4	3	3	Unclear security gain over well-engineered classical entropy sources; Few published throughput or entropy figures for consumer chips; Need for whole-system audits and protection against side-channel attacks; Device-independent certification is slow and relies on strict assumptions	2026-10-21
Quantum repeaters and quantum networks	Research and prototypes	2	4	4	Low entanglement rates and fidelities over fibre; No repeater chain shown over long distances in the sources reviewed; Quantum memories with long storage times and high fidelity are still at laboratory scale; Fibre losses and environmental effects on deployed fibre	2026-10-21
Quantum sensors	Pilot and early commercial	3	4	4	Size, power and cost of laboratory-grade systems; Operation outside controlled environments; Shortage of specialised components and skilled staff; Limited independent performance data from field trials	2026-10-21
Recirculating aquaculture systems	Commercial	4	3	2	High energy demand and running costs; High capital cost compared with net pens; Single points of failure in filtration, oxygen and pumping; Limited commercial-scale evidence on fish welfare	2026-10-22
Retinal prostheses and vision restoration	Pilot and early commercial	4	3	3	Modest visual gains compared with what people hope for; Surgical risk and complications such as conjunctival erosion; Discontinued commercial support for an earlier system; Limited evidence from small trials and no large comparative study in the sources reviewed	2026-10-21
Reusable launch vehicles	Pilot and early commercial	4	3	3	Refurbishment and turnaround costs; Durability of engines and structures under repeated flights; Fixed operations costs that only fall with a high flight rate	2026-10-21
Robotic fruit and vegetable harvesting	Pilot and early commercial	3	3	4	Picking speed and cycle time in published trials are not yet clearly at human level; Occlusion and variable crop structure reduce success rates; Capital cost and the number of machines needed per farm; Independent evidence of commercial performance is limited; Crop layouts and varieties often need adapting for each robot	2026-10-21
Rolling bearings	Commercial	5	3	2	Precision grinding and hardened steel are expensive to make reliably; Lubrication, sealing and wear limit life in demanding conditions; Sources differ on some early details, which makes the record harder to verify	2026-10-22
Satellite broadband constellations	Commercial	5	3	4	Cost of user terminals and monthly subscriptions; Sky brightness and astronomy interference; Orbital debris and collision risk in low Earth orbit; Capacity limits in crowded areas; Regulatory delays and milestone changes	2026-10-22
Satellite methane detection	Pilot and early commercial	3	3	4	Detection limits depend on wind, surface and instrument design, so a single number does not describe performance; Mapping a plume to a specific facility needs finer resolution or inventory data; Verified evidence that alerts lead to repairs is limited; Single-mission risk, shown by the loss of MethaneSAT in 2025	2026-10-21
Satellite navigation (GNSS)	Commercial	5	4	3	Jamming and spoofing of civil signals; Receivers must implement new authentication before they can use it; Existing devices need upgrading to benefit from new services	2026-10-22
Seawater electrolysis	Lab demonstration	2	3	4	Chloride corrosion and chlorine by-products; Mineral fouling from magnesium and calcium; Lack of full-system durability and cost data; Competition from purified-water electrolysis with existing supply chains	2026-10-21
Seaweed farming at scale	Pilot and early commercial	3	2	3	Disputed net carbon balance of seaweed ecosystems; Costly measurement, reporting and verification of carbon storage; Limited evidence on methane reduction across diverse diets and farm conditions; Crop losses from storms, disease and warm water	2026-10-21
Self-healing polymers	Research and prototypes	2	4	3	Trade-off between healing ability and mechanical strength; Need for heat, pressure or time to heal in many systems; Limited data on long-term durability and fatigue in real service; Added material cost and processing complexity	2026-10-20
Self-monitoring infrastructure	Pilot and early commercial	4	3	3	Long-term sensor reliability, power supply and calibration; Turning anomalies into reliable decisions without false alarms; Lifecycle cost of installation, communications, data systems and staff time; Data ownership, cyber security and dependence on vendors; Limited independent evidence beyond short field evaluations	2026-10-21
Silicon spin qubits	Research and prototypes	2	4	4	Only two-qubit devices and small arrays have been demonstrated in peer-reviewed work; Residual nuclear spins limit fidelity and push up the need for isotopically enriched silicon; Error-corrected logical qubits from silicon spins have not been reported in the sources reviewed	2026-10-21
Sleep neurostimulation	Pilot and early commercial	2	2	3	Inconsistent memory results across replications; Small sample sizes in published studies; Few independent tests of consumer devices; Electrical stimulation adds EEG noise and may limit measurement quality	2026-10-22
Small modular nuclear reactors	Pilot and early commercial	4	3	4	Cost per unit of power has no verified figures in the sources reviewed here; Each site needs its own licence; Limited operating experience for the new designs	2026-10-21
Smart contact lenses	Pilot and early commercial	3	3	2	Comfort, irritation and safety for daily wear; Reliable, absolute readings that clinicians can trust; Regulatory approval for each new use; Funding after two major lens programmes stopped	2026-10-21
Smart textiles	Research and prototypes	3	3	4	Lack of standard washing and durability tests, so performance claims cannot be compared; Conductive coatings such as silver degrade under washing, heat and drying; Manufacturing scale-up and cost for fibre-based electronics; Comfort, appearance and care requirements for everyday clothing	2026-10-21
Sodium-ion batteries	Pilot and early commercial	4	3	4	Energy density below leading lithium-ion chemistries; Uncertain cost advantage while lithium prices are low; Limited independent data on long-term performance of commercial cells; Immature hard carbon and cathode supply chains	2026-10-20
Soft exosuits	Pilot and early commercial	4	3	4	Limited evidence on long-term clinical benefit; High cost of the commercial system at clearance; Dependence of benefit on the wearer's walking ability; Clinic-based use so far, with no home-use evidence in the sources reviewed	2026-10-21
Soft robotic grippers	Research and prototypes	3	3	4	Limited control precision and speed compared with rigid grippers; Durability and wear of soft materials under repeated use; Need for compressed air or other actuation hardware	2026-10-21
Solar sails	Research and prototypes	3	4	2	Very low thrust, so orbit changes build slowly; Reliable deployment of large membranes and booms; Changes to sail shape under light pressure; Drag and material degradation in low Earth orbit	2026-10-22
Solid-state batteries	Research and prototypes	2	3	4	Materials and processing challenges in composite cathodes and lithium-metal anodes; Dendrite growth at lithium-metal anodes; Processing and mechanical robustness of cells at scale	2026-10-21
Solid-state lidar	Pilot and early commercial	4	3	3	Range under eye-safety limits on emitted power; Verified long-range performance for chip-scale designs; Cost and manufacturing yield; Supplier financial risk, shown by the Luminar bankruptcy	2026-10-21
Space biomanufacturing	Lab demonstration	2	2	3	No demonstration yet with real Martian materials; Energy, reactor and processing mass not yet shown to be practical; Planetary protection rules and mission approval; Product qualification for structural use	2026-10-21
Space debris removal	Pilot and early commercial	3	3	4	Cost per removal and total mission budgets; Liability and consent rules for removing another state's object; Slipping launch schedules; No reported capture and removal of a derelict object yet	2026-10-21
Space weather forecasting	Commercial	4	4	3	Arrival-time errors of many hours for coronal mass ejections (Riley and colleagues, 2018); Limited warning for flares, which arrive in minutes; Cost and funding for dedicated monitoring spacecraft such as SOLAR-1 and Vigil	2026-10-22
Space-based solar power	Research and prototypes	2	3	3	Launch cost and the number of launches needed for a multi-gigawatt system; End-to-end efficiency and beam safety not yet demonstrated at useful power and scale; Falling costs of terrestrial solar, wind and batteries; Debris, spectrum and airspace rules for large structures and beams	2026-10-21
Spinal cord stimulation for paralysis	Pilot and early commercial	4	3	4	Small evidence base for epidural systems; Single-arm trial design with no sham control for the non-invasive system; Cost, clinical training and access to specialist rehabilitation centres; Limited data on long-term benefit and on injuries beyond the cleared population	2026-10-21
Sprayable RNA biopesticides	Pilot and early commercial	4	2	4	Production cost per gram of dsRNA at commercial scale; Short persistence of sprayed RNA on leaves and in weather; Evolution of pest resistance to a single target gene; Limited independent field and non-target data; Regulatory registration confined to a three-year term for each use	2026-10-21
Springs and vehicle suspension	Commercial	5	3	3	Trade-off between road holding and ride comfort; Cost and complexity of advanced systems; Weight and space needed around each wheel	2026-10-22
Stratospheric aerosol injection	Theory	1	3	3	No agreed international governance for outdoor experiments or deployment; Uncertain and uneven regional effects, including on ozone; Disputed size of the termination shock risk; Opposition from communities and Indigenous groups to outdoor tests	2026-10-21
Structural batteries	Lab demonstration	2	3	3	No demonstrated complete product with a load-bearing battery structure; Net mass saving at product level is not established; Safety, damage tolerance, repair and recycling of integrated components; High power delivery with current semi-solid electrolytes	2026-10-21
Superconducting power cables	Pilot and early commercial	3	3	3	Refrigeration, pumping and terminations add energy use, cost and failure points; Few long-term operating datasets are publicly available; Conventional cables, substations and HVDC links are established and cheaper where space allows	2026-10-21
Superconducting quantum computers	Research and prototypes	3	4	4	Error rates are still too high for long algorithms; Wiring and cooling grow with the number of qubits; Reported performance figures use different conditions and are hard to compare	2026-10-21
Swarm robotics	Research and prototypes	4	3	4	Individual robots are unreliable, and error rates rise with group size; Safety and regulatory approval for flying or mobile swarms near people; Limited public field evidence beyond small groups; Secrecy and unverified figures in military programmes	2026-10-21
The electric motor	Commercial	5	4	4	Rare earth magnet supply and price swings; Lower torque density in some magnet-free and ferrite designs; Cost and efficiency targets for mass-market vehicles	2026-10-22
The internal combustion engine	Commercial	5	4	2	Emissions limits on combustion; Competition from electric motors and batteries; Dependence on fuel supply and fuel prices	2026-10-22
The motor car	Commercial	5	4	3	Early electric cars needed charging, and few Americans outside cities had electricity at that time; Gasoline cars gained advantages from better roads, cheap crude oil and spreading filling stations; Electric cars have had limited range; the DOE article gives a typical range of about 40 miles in the 1970s	2026-10-22
The steam engine	Commercial	5	4	2	Weight of the boiler, fuel and water in a vehicle; Low thermal efficiency in early designs (Carr and Cowart, 2012); Road rules such as the Locomotives Act 1865	2026-10-22
The wheel and axle	Commercial	5	3	2	Wooden wheels rarely survive in the ground; Pictures on pottery are open to interpretation; Sledges stayed in use alongside wheels	2026-10-22
Thermal energy storage	Pilot and early commercial	4	3	4	Round-trip efficiency for electricity is lower than for heat-only storage, and power blocks add cost; Few operating projects with independently verified, multi-year performance data; Insulation and heat losses over long storage periods; Capital cost and the need for site-specific integration with existing heat users	2026-10-21
Thermoelectric generators	Pilot and early commercial	3	3	3	Low conversion efficiency relative to the Carnot limit; Small usable temperature differences on the body and in ambient conditions; Difficulty comparing reported power figures across differently tested devices	2026-10-21
Thin-film flexible robots	Research and prototypes	2	3	3	Tethered operation with high-voltage supplies and external control; Adhesion sensitive to surface condition, dust and curvature; Durability and safety of high-voltage electrostatic systems; Machining repeatability for industrial use not yet shown	2026-10-21
Thin-film lithium niobate photonics	Pilot and early commercial	3	3	4	Volume wafer supply and a commercial foundry able to produce at scale; Bias drift and photorefractive effects at higher optical power; Limited independent performance data for commercial products; Packaging and fibre-to-chip coupling costs, shared with other photonic platforms	2026-10-22
Topological qubits	Lab demonstration	1	2	3	Scientific dispute over whether topological modes have been demonstrated; Retracted earlier Majorana claim that reduces trust in the field; No published gate fidelities or multi-qubit operations in the sources reviewed; Long, uncertain path from single-shot readout to fault-tolerant machines	2026-10-22
Transparent wood	Research and prototypes	2	3	4	High haze at application thicknesses; Unproven long-term outdoor durability under UV, humidity and heat; Scale-up without loss of optical quality; Chemical processing that can involve toxic by-products; Competition from glass and established panel products	2026-10-21
Trapped-ion quantum computers	Pilot and early commercial	3	3	4	Gate and clock speed limit how many operations fit into a run; Accuracy has not yet been shown at much larger qubit counts; Most headline figures are company-reported and await independent reproduction; Competition from other quantum hardware platforms	2026-10-21
Two-photon lithography and nanoscale 3D printing	Research and prototypes	3	4	3	Shortage of two-photon polymerisable resins; Scaling beyond micrometre-scale demonstrations has not been shown in the sources reviewed; Verified throughput and cost data for commercial use are not in the sources reviewed	2026-10-21
Vagus nerve stimulation	Commercial	4	3	3	Surgery and implant risks for implanted systems; Modest and sometimes unclear effect sizes in controlled trials outside epilepsy; Reimbursement and clinical pathways for new indications	2026-10-21
Vehicle brakes	Commercial	5	4	2	Cost of electronic sensors and control units in lower-priced cars; Early drum and disc designs depended on materials and wear adjustment that were not yet understood; Need for systems that keep working reliably over a vehicle's life	2026-10-22
Vehicle safety systems	Commercial	5	4	3	Regulation differs between countries and changes slowly; Cost and weight of added equipment in lower-priced cars	2026-10-22
Vehicle steering	Commercial	5	4	3	Safety assurance for systems without a mechanical backup; Cost of electric and electronic steering components; Driver acceptance of steering feel and feedback	2026-10-22
Vehicle-to-grid	Pilot and early commercial	3	2	3	Uncertain battery wear from discharging, with mixed lab and simulation evidence; Limited number of qualifying vehicles and bidirectional chargers; Low owner payments relative to charger and metering costs; Need for smart metering and standards-compliant communication between car, charger and operator	2026-10-21
Vertical farming and controlled-environment agriculture	Commercial	4	3	3	High electricity use for lighting and climate control; Upfront capital costs and the need for trained staff; Limited real-world data and inconsistent reporting standards; Competition from low-cost field and greenhouse production	2026-10-21
Vulcanised rubber and pneumatic tyres	Commercial	5	4	2	Tyres had to stay on the rim, and early designs needed fixes such as the clincher bead and the detachable tyre; Competing patents and disputes over priority	2026-10-22
Warehouse picking robots	Pilot and early commercial	3	2	4	Limited published error rates and accuracy figures from deployments; Difficult items such as soft, porous or irregular products; Need for human handover when a pick fails; Cost and integration effort in existing warehouses	2026-10-21
Wearable ultrasound patches	Research and prototypes	2	3	3	Prototypes are still tethered to computers or benchtop instruments; Small human studies so far, with no large or patient-based trials reported in the sources reviewed; Regulatory route and clinical validation not established for the commercial cardiac patch; Long-term skin comfort, safety and reliability of the adhesive and coupling layers are not yet shown	2026-10-21
Wireless charging roads	Pilot and early commercial	2	2	3	Cost of road construction, grid connection and vehicle receivers; Lack of independently measured end-to-end efficiency; Durability under weather, traffic and road repair; Lack of a shared standard for vehicles and road equipment across suppliers	2026-10-21

Readiness: how close to real-world use. Evidence quality: how strong and independent the published evidence is. Momentum: how active the field has been recently. Impact is recorded as a hypothesis on each profile, not a rating.